使用Java,我有一个系统类,该类具有用于显示计算机系统详细信息的不同方法。然后,我有一个测试系统类,该类使用switch语句将这些方法作为菜单调用。如果用户输入选项1或2,则它会显示一些我已硬编码的输入。但是,如果他们选择选项三,那么他们将被提升为输入他们自己的输入。
如果他们在选项3中输入然后再次输入选项1和2,那么我如何获得选项1和2而不是我的输入呢?
我是一个完全的新手,我不确定该怎么做,我已经在网上和书籍中进行了研究,并在想某处是否有其他说法,但我可能是错的。任何意见,将不胜感激。
这是我的代码:
import java.util.Scanner;
public class SystemTest_Y3881268 {
public static void main(String[] args) {
//Create System_Y3881268 object and test methods
System_Y3881268 s=new System_Y3881268("Lenovo","Ideacentre A340-24IWL",2);
s.setHardDisk(2);
s.setMemory(128);
s.setPurchaseCost(599);
//Create textual menu
int memorySize;
double hardDiskSize;
@SuppressWarnings("resource")
Scanner keyboard = new Scanner(System.in);
char choice;
do
{
System.out.println();
System.out.println("***** Computer system menu *****");
System.out.println();
System.out.println("Choice 1: Print System Details");
System.out.println("Choice 2: Diagnose System");
System.out.println("Choice 3: Set Details");
System.out.println("Choice 4: Print System Properties");
System.out.println("Choice 5: Quit the Program");
System.out.println();
System.out.println("Enter a number from 1 - 5");
System.out.println();
choice = keyboard.next().charAt(0);
switch(choice)
{
case '1':
{
s.displayDetails();
}
break;
case '2':
{
s.diagnoseSystem();
}
break;
case '3':
{
System.out.println("Enter hard disk size in GB: ");
hardDiskSize = keyboard.nextDouble();
if(hardDiskSize<2)
{
System.out.println("Hard disk size = Low");
}
else
{
System.out.println("Hard disk size = Ok");
}
System.out.println();
System.out.println("Enter memory size in MB: ");
memorySize = keyboard.nextInt();
if(memorySize<128)
{
System.out.println("Memory Ok = False");
}
else
{
System.out.println("Memory Ok = True");
}
}
break;
case '4' :
{
System_Y3881268.displaySystemProperties();
}
break;
case '5' : break;
default : System.out.println("Enter only numbers from 1 - 5");
System.out.println();
}
} while(choice != '5');
}
}